Diddy wasn't only defending himself...but he was defending his son.

Sources are telling TMZ Sports that Diddy wasn't only defending himself from UCLA strength and conditioning coach Sal Alosi, but also standing up for his son, who Alosi was on a mission to tear down.

Sources told the celebrity website that Alosi engaged in "psychological warfare against Justin for the past three years" and was "verbally abusive to the extreme," publicly humiliating Justin on several occasions. 

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Diddy was aware of the psychological bullying and it all came to a head during their confrontation, which led to the rap mogul's arrest Monday. Diddy quickly posted $50,000 bail and was released later that night. 
Justin thanked his dad for having his back.  

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